Uncommon masturbation technique in which the masturbator either a) uses both hands in a crab-like manner (thumb is one aspect of pincer, remaining fingers are the other pincer) to induce pleasure by sliding up and down the shaft or b) uses one hand on the dickhead; prevalent in the Mormon community, where young men are left to their own devices on how to jerk it.

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A dance move where one puts a large frown on his face, crosses his eyes and moves around making crab pincers with his hands. It is essential to get up into peoples person space while preforming the Crab Hands.

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When your hands start to make shapes similar to that of a crabs hand/claw while playing Guitar Hero. Also known as Guitarthritis.
Some also call it Crabbing which is the the actual process of getting crab hands.

John Hey look at my note streak
Dave Nice keep it going
John Oooh god...im crabbing!!!!
Dave Man that was not a good time for crab hands.
John Your telling me.